gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2deviceprovider.c

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/* GStreamer
* Copyright (C) 2012 Olivier Crete <olivier.crete@collabora.com>
*
* gstv4l2deviceprovider.c: V4l2 device probing and monitoring
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstv4l2deviceprovider.h"
#include <string.h>
#include <sys/stat.h>
#include <gst/gst.h>
#include "gstv4l2object.h"
#include "v4l2-utils.h"
#include "gstv4l2elements.h"
#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif
static GstV4l2Device *gst_v4l2_device_new (const gchar * device_path,
const gchar * device_name, GstCaps * caps, GstV4l2DeviceType type,
GstStructure * props);
G_DEFINE_TYPE (GstV4l2DeviceProvider, gst_v4l2_device_provider,
GST_TYPE_DEVICE_PROVIDER);
GST_DEVICE_PROVIDER_REGISTER_DEFINE (v4l2deviceprovider, "v4l2deviceprovider",
GST_RANK_PRIMARY, GST_TYPE_V4L2_DEVICE_PROVIDER);
static void gst_v4l2_device_provider_finalize (GObject * object);
static GList *gst_v4l2_device_provider_probe (GstDeviceProvider * provider);
#ifdef HAVE_GUDEV
static gboolean gst_v4l2_device_provider_start (GstDeviceProvider * provider);
static void gst_v4l2_device_provider_stop (GstDeviceProvider * provider);
#endif
static void
gst_v4l2_device_provider_class_init (GstV4l2DeviceProviderClass * klass)
{
GstDeviceProviderClass *dm_class = GST_DEVICE_PROVIDER_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
dm_class->probe = gst_v4l2_device_provider_probe;
#ifdef HAVE_GUDEV
dm_class->start = gst_v4l2_device_provider_start;
dm_class->stop = gst_v4l2_device_provider_stop;
#endif
gobject_class->finalize = gst_v4l2_device_provider_finalize;
gst_device_provider_class_set_static_metadata (dm_class,
"Video (video4linux2) Device Provider", "Source/Sink/Video",
"List and monitor video4linux2 source and sink devices",
"Olivier Crete <olivier.crete@collabora.com>");
}
static void
gst_v4l2_device_provider_init (GstV4l2DeviceProvider * provider)
{
#ifdef HAVE_GUDEV
g_cond_init (&provider->started_cond);
#endif
}
static void
gst_v4l2_device_provider_finalize (GObject * object)
{
#ifdef HAVE_GUDEV
GstV4l2DeviceProvider *provider = GST_V4L2_DEVICE_PROVIDER (object);
g_cond_clear (&provider->started_cond);
#endif
G_OBJECT_CLASS (gst_v4l2_device_provider_parent_class)->finalize (object);
}
static GstV4l2Device *
gst_v4l2_device_provider_probe_device (GstV4l2DeviceProvider * provider,
const gchar * device_path, const gchar * device_name, GstStructure * props)
{
GstV4l2Object *v4l2obj = NULL;
GstCaps *caps;
GstV4l2Device *device = NULL;
struct stat st;
GstV4l2DeviceType type = GST_V4L2_DEVICE_TYPE_INVALID;
g_return_val_if_fail (props != NULL, NULL);
if (stat (device_path, &st) == -1)
goto destroy;
if (!S_ISCHR (st.st_mode))
goto destroy;
v4l2obj = gst_v4l2_object_new (NULL, GST_OBJECT (provider),
V4L2_BUF_TYPE_VIDEO_CAPTURE, device_path, NULL, NULL, NULL);
if (!gst_v4l2_open (v4l2obj, NULL))
goto destroy;
gst_structure_set (props, "device.api", G_TYPE_STRING, "v4l2", NULL);
gst_structure_set (props, "device.path", G_TYPE_STRING, device_path, NULL);
gst_structure_set (props, "v4l2.device.driver", G_TYPE_STRING,
v4l2obj->vcap.driver, NULL);
gst_structure_set (props, "v4l2.device.card", G_TYPE_STRING,
v4l2obj->vcap.card, NULL);
gst_structure_set (props, "v4l2.device.bus_info", G_TYPE_STRING,
v4l2obj->vcap.bus_info, NULL);
gst_structure_set (props, "v4l2.device.version", G_TYPE_UINT,
v4l2obj->vcap.version, NULL);
gst_structure_set (props, "v4l2.device.capabilities", G_TYPE_UINT,
v4l2obj->vcap.capabilities, NULL);
gst_structure_set (props, "v4l2.device.device_caps", G_TYPE_UINT,
v4l2obj->vcap.device_caps, NULL);
if (v4l2obj->device_caps &
v4l2deviceprovider: Ignore touch sensing devices With GST_V4L2_USE_LIBV4L2=1, my laptop's touchpad shows up as a video source device in gst-device-monitor, but attempting to stream from it fails because the device doesn't actually support any video formats. name : Synaptics RMI4 Touch Sensor class : Video/Source caps : video/x-raw, format=(string)I420, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)YV12, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)BGR, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)RGB, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; properties: udev-probed = true device.bus_path = /sys/devices/rmi4-00/rmi4-00.fn54/video4linux/v4l-touch0 sysfs.path = /sys/devices/rmi4-00/rmi4-00.fn54/video4linux/v4l-touch0 device.subsystem = video4linux device.product.name = "Synaptics\ RMI4\ Touch\ Sensor" device.capabilities = :capture: device.api = v4l2 device.path = /dev/v4l-touch0 v4l2.device.driver = rmi4_f54 v4l2.device.card = "Synaptics\ RMI4\ Touch\ Sensor" v4l2.device.bus_info = rmi4:rmi4-00.fn54 v4l2.device.version = 265480 (0x00040d08) v4l2.device.capabilities = 2501902337 (0x95200001) v4l2.device.device_caps = 354418689 (0x15200001) gst-launch-1.0 v4l2src device=/dev/v4l-touch0 ! ... v4l2-ctl -d /dev/v4l-touch0 --list-formats reports: ioctl: VIDIOC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: 'TD16' Name : 16-bit signed deltas Index : 1 Type : Video Capture Pixel Format: 'TD08' Name : 8-bit signed deltas Index : 2 Type : Video Capture Pixel Format: 'TU16' Name : 16-bit unsigned touch data https://bugzilla.gnome.org/show_bug.cgi?id=789197
2017-10-19 12:02:37 +00:00
(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) {
/* We ignore touch sensing devices; those are't really video */
if (v4l2obj->device_caps & V4L2_CAP_TOUCH)
goto close;
type = GST_V4L2_DEVICE_TYPE_SOURCE;
v4l2obj->skip_try_fmt_probes = TRUE;
v4l2deviceprovider: Ignore touch sensing devices With GST_V4L2_USE_LIBV4L2=1, my laptop's touchpad shows up as a video source device in gst-device-monitor, but attempting to stream from it fails because the device doesn't actually support any video formats. name : Synaptics RMI4 Touch Sensor class : Video/Source caps : video/x-raw, format=(string)I420, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)YV12, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)BGR, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)RGB, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)0, height=(int)0, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; properties: udev-probed = true device.bus_path = /sys/devices/rmi4-00/rmi4-00.fn54/video4linux/v4l-touch0 sysfs.path = /sys/devices/rmi4-00/rmi4-00.fn54/video4linux/v4l-touch0 device.subsystem = video4linux device.product.name = "Synaptics\ RMI4\ Touch\ Sensor" device.capabilities = :capture: device.api = v4l2 device.path = /dev/v4l-touch0 v4l2.device.driver = rmi4_f54 v4l2.device.card = "Synaptics\ RMI4\ Touch\ Sensor" v4l2.device.bus_info = rmi4:rmi4-00.fn54 v4l2.device.version = 265480 (0x00040d08) v4l2.device.capabilities = 2501902337 (0x95200001) v4l2.device.device_caps = 354418689 (0x15200001) gst-launch-1.0 v4l2src device=/dev/v4l-touch0 ! ... v4l2-ctl -d /dev/v4l-touch0 --list-formats reports: ioctl: VIDIOC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: 'TD16' Name : 16-bit signed deltas Index : 1 Type : Video Capture Pixel Format: 'TD08' Name : 8-bit signed deltas Index : 2 Type : Video Capture Pixel Format: 'TU16' Name : 16-bit unsigned touch data https://bugzilla.gnome.org/show_bug.cgi?id=789197
2017-10-19 12:02:37 +00:00
}
if (v4l2obj->device_caps &
(V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)) {
/* We ignore M2M devices that are both capture and output for now
* The provider is not for them */
if (type != GST_V4L2_DEVICE_TYPE_INVALID)
goto close;
type = GST_V4L2_DEVICE_TYPE_SINK;
/* We have opened as a capture as we didn't know, now that know,
* let's fixed it */
if (v4l2obj->device_caps & V4L2_CAP_VIDEO_OUTPUT_MPLANE)
v4l2obj->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
else
v4l2obj->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
}
if (type == GST_V4L2_DEVICE_TYPE_INVALID)
goto close;
caps = gst_v4l2_object_get_caps (v4l2obj, NULL);
if (caps == NULL)
goto close;
if (gst_caps_is_empty (caps)) {
gst_caps_unref (caps);
goto close;
}
device = gst_v4l2_device_new (device_path,
device_name ? device_name : (gchar *) v4l2obj->vcap.card, caps, type,
props);
gst_caps_unref (caps);
close:
gst_v4l2_close (v4l2obj);
destroy:
if (v4l2obj)
gst_v4l2_object_destroy (v4l2obj);
if (props)
gst_structure_free (props);
return device;
}
static GList *
gst_v4l2_device_provider_probe (GstDeviceProvider * provider)
{
GstV4l2DeviceProvider *self = GST_V4L2_DEVICE_PROVIDER (provider);
GstV4l2Iterator *it;
GList *devices = NULL;
it = gst_v4l2_iterator_new ();
while (gst_v4l2_iterator_next (it)) {
GstStructure *props;
GstV4l2Device *device;
props = gst_structure_new ("v4l2-proplist", "device.path", G_TYPE_STRING,
it->device_path, "udev-probed", G_TYPE_BOOLEAN, FALSE, NULL);
device = gst_v4l2_device_provider_probe_device (self, it->device_path, NULL,
props);
if (device) {
gst_object_ref_sink (device);
devices = g_list_prepend (devices, device);
}
}
gst_v4l2_iterator_free (it);
return devices;
}
#ifdef HAVE_GUDEV
static GstDevice *
gst_v4l2_device_provider_device_from_udev (GstV4l2DeviceProvider * provider,
GUdevDevice * udev_device)
{
GstV4l2Device *gstdev;
const gchar *device_path = g_udev_device_get_device_file (udev_device);
const gchar *device_name, *str;
GstStructure *props;
props = gst_structure_new ("v4l2deviceprovider", "udev-probed",
G_TYPE_BOOLEAN, TRUE, NULL);
str = g_udev_device_get_property (udev_device, "ID_PATH");
if (!(str && *str)) {
str = g_udev_device_get_sysfs_path (udev_device);
}
if (str && *str)
gst_structure_set (props, "device.bus_path", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_sysfs_path (udev_device)) && *str)
gst_structure_set (props, "sysfs.path", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_ID")) && *str)
gst_structure_set (props, "udev.id", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_BUS")) && *str)
gst_structure_set (props, "device.bus", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "SUBSYSTEM")) && *str)
gst_structure_set (props, "device.subsystem", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_VENDOR_ID")) && *str)
gst_structure_set (props, "device.vendor.id", G_TYPE_STRING, str, NULL);
str = g_udev_device_get_property (udev_device, "ID_VENDOR_FROM_DATABASE");
if (!(str && *str)) {
str = g_udev_device_get_property (udev_device, "ID_VENDOR_ENC");
if (!(str && *str)) {
str = g_udev_device_get_property (udev_device, "ID_VENDOR");
}
}
if (str && *str)
gst_structure_set (props, "device.vendor.name", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_MODEL_ID")) && *str)
gst_structure_set (props, "device.product.id", G_TYPE_STRING, str, NULL);
device_name = g_udev_device_get_property (udev_device, "ID_V4L_PRODUCT");
if (!(device_name && *device_name)) {
device_name =
g_udev_device_get_property (udev_device, "ID_MODEL_FROM_DATABASE");
if (!(device_name && *device_name)) {
device_name = g_udev_device_get_property (udev_device, "ID_MODEL_ENC");
if (!(device_name && *device_name)) {
device_name = g_udev_device_get_property (udev_device, "ID_MODEL");
}
}
}
if (device_name && *device_name)
gst_structure_set (props, "device.product.name", G_TYPE_STRING, device_name,
NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_SERIAL")) && *str)
gst_structure_set (props, "device.serial", G_TYPE_STRING, str, NULL);
if ((str = g_udev_device_get_property (udev_device, "ID_V4L_CAPABILITIES"))
&& *str)
gst_structure_set (props, "device.capabilities", G_TYPE_STRING, str, NULL);
gstdev = gst_v4l2_device_provider_probe_device (provider, device_path,
device_name, props);
if (gstdev)
gstdev->syspath = g_strdup (g_udev_device_get_sysfs_path (udev_device));
return GST_DEVICE (gstdev);
}
static void
uevent_cb (GUdevClient * client, const gchar * action, GUdevDevice * device,
GstV4l2DeviceProvider * self)
{
GstDeviceProvider *provider = GST_DEVICE_PROVIDER (self);
/* Not V4L2, ignoring */
if (g_udev_device_get_property_as_int (device, "ID_V4L_VERSION") != 2)
return;
if (!strcmp (action, "add")) {
GstDevice *gstdev = NULL;
gstdev = gst_v4l2_device_provider_device_from_udev (self, device);
if (gstdev)
gst_device_provider_device_add (provider, gstdev);
} else if (!strcmp (action, "remove")) {
GstV4l2Device *gstdev = NULL;
GList *item;
GST_OBJECT_LOCK (self);
for (item = provider->devices; item; item = item->next) {
gstdev = item->data;
if (!strcmp (gstdev->syspath, g_udev_device_get_sysfs_path (device))) {
gst_object_ref (gstdev);
break;
}
gstdev = NULL;
}
GST_OBJECT_UNLOCK (provider);
if (gstdev) {
gst_device_provider_device_remove (provider, GST_DEVICE (gstdev));
g_object_unref (gstdev);
}
} else {
GST_WARNING ("Unhandled action %s", action);
}
}
static gpointer
provider_thread (gpointer data)
{
GstV4l2DeviceProvider *provider = data;
GMainContext *context = NULL;
GMainLoop *loop = NULL;
GUdevClient *client;
GList *devices;
static const gchar *subsystems[] = { "video4linux", NULL };
GST_OBJECT_LOCK (provider);
if (provider->context)
context = g_main_context_ref (provider->context);
if (provider->loop)
loop = g_main_loop_ref (provider->loop);
if (context == NULL || loop == NULL) {
provider->started = TRUE;
g_cond_broadcast (&provider->started_cond);
g_clear_pointer (&loop, g_main_loop_unref);
g_clear_pointer (&context, g_main_context_unref);
GST_OBJECT_UNLOCK (provider);
return NULL;
}
GST_OBJECT_UNLOCK (provider);
g_main_context_push_thread_default (context);
client = g_udev_client_new (subsystems);
g_signal_connect (client, "uevent", G_CALLBACK (uevent_cb), provider);
devices = g_udev_client_query_by_subsystem (client, "video4linux");
while (devices) {
GUdevDevice *udev_device = devices->data;
GstDevice *gstdev;
devices = g_list_remove (devices, udev_device);
if (g_udev_device_get_property_as_int (udev_device, "ID_V4L_VERSION") == 2) {
gstdev =
gst_v4l2_device_provider_device_from_udev (provider, udev_device);
if (gstdev)
gst_device_provider_device_add (GST_DEVICE_PROVIDER (provider), gstdev);
}
g_object_unref (udev_device);
}
GST_OBJECT_LOCK (provider);
provider->started = TRUE;
g_cond_broadcast (&provider->started_cond);
GST_OBJECT_UNLOCK (provider);
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_object_unref (client);
g_main_context_unref (context);
gst_object_unref (provider);
return NULL;
}
static gboolean
gst_v4l2_device_provider_start (GstDeviceProvider * provider)
{
GstV4l2DeviceProvider *self = GST_V4L2_DEVICE_PROVIDER (provider);
GST_OBJECT_LOCK (self);
g_assert (self->context == NULL);
self->context = g_main_context_new ();
self->loop = g_main_loop_new (self->context, FALSE);
self->thread = g_thread_new ("v4l2-device-provider", provider_thread,
g_object_ref (self));
while (self->started == FALSE)
g_cond_wait (&self->started_cond, GST_OBJECT_GET_LOCK (self));
GST_OBJECT_UNLOCK (self);
return TRUE;
}
static void
gst_v4l2_device_provider_stop (GstDeviceProvider * provider)
{
GstV4l2DeviceProvider *self = GST_V4L2_DEVICE_PROVIDER (provider);
GMainContext *context;
GMainLoop *loop;
GSource *idle_stop_source;
GST_OBJECT_LOCK (self);
context = self->context;
loop = self->loop;
self->context = NULL;
self->loop = NULL;
GST_OBJECT_UNLOCK (self);
if (!context || !loop) {
g_clear_pointer (&self->loop, g_main_loop_unref);
g_clear_pointer (&self->context, g_main_context_unref);
return;
}
idle_stop_source = g_idle_source_new ();
g_source_set_callback (idle_stop_source, (GSourceFunc) g_main_loop_quit, loop,
NULL);
g_source_attach (idle_stop_source, context);
g_source_unref (idle_stop_source);
g_thread_join (self->thread);
self->thread = NULL;
self->started = FALSE;
g_main_loop_unref (loop);
g_main_context_unref (context);
}
#endif
enum
{
PROP_DEVICE_PATH = 1,
};
G_DEFINE_TYPE (GstV4l2Device, gst_v4l2_device, GST_TYPE_DEVICE);
static void gst_v4l2_device_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_v4l2_device_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_v4l2_device_finalize (GObject * object);
static GstElement *gst_v4l2_device_create_element (GstDevice * device,
const gchar * name);
static void
gst_v4l2_device_class_init (GstV4l2DeviceClass * klass)
{
GstDeviceClass *dev_class = GST_DEVICE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
dev_class->create_element = gst_v4l2_device_create_element;
object_class->get_property = gst_v4l2_device_get_property;
object_class->set_property = gst_v4l2_device_set_property;
object_class->finalize = gst_v4l2_device_finalize;
g_object_class_install_property (object_class, PROP_DEVICE_PATH,
g_param_spec_string ("device-path", "Device Path",
"The Path of the device node", "",
G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}
static void
gst_v4l2_device_init (GstV4l2Device * device)
{
}
static void
gst_v4l2_device_finalize (GObject * object)
{
GstV4l2Device *device = GST_V4L2_DEVICE (object);
g_free (device->device_path);
g_free (device->syspath);
G_OBJECT_CLASS (gst_v4l2_device_parent_class)->finalize (object);
}
static GstElement *
gst_v4l2_device_create_element (GstDevice * device, const gchar * name)
{
GstV4l2Device *v4l2_dev = GST_V4L2_DEVICE (device);
GstElement *elem;
elem = gst_element_factory_make (v4l2_dev->element, name);
g_object_set (elem, "device", v4l2_dev->device_path, NULL);
return elem;
}
static GstV4l2Device *
gst_v4l2_device_new (const gchar * device_path, const gchar * device_name,
GstCaps * caps, GstV4l2DeviceType type, GstStructure * props)
{
GstV4l2Device *gstdev;
const gchar *element = NULL;
const gchar *klass = NULL;
g_return_val_if_fail (device_path, NULL);
g_return_val_if_fail (device_name, NULL);
g_return_val_if_fail (caps, NULL);
switch (type) {
case GST_V4L2_DEVICE_TYPE_SOURCE:
element = "v4l2src";
klass = "Video/Source";
break;
case GST_V4L2_DEVICE_TYPE_SINK:
element = "v4l2sink";
klass = "Video/Sink";
break;
default:
g_assert_not_reached ();
break;
}
gstdev = g_object_new (GST_TYPE_V4L2_DEVICE, "device-path", device_path,
"display-name", device_name, "caps", caps, "device-class", klass,
"properties", props, NULL);
gstdev->element = element;
return gstdev;
}
static void
gst_v4l2_device_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstV4l2Device *device;
device = GST_V4L2_DEVICE_CAST (object);
switch (prop_id) {
case PROP_DEVICE_PATH:
g_value_set_string (value, device->device_path);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4l2_device_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstV4l2Device *device;
device = GST_V4L2_DEVICE_CAST (object);
switch (prop_id) {
case PROP_DEVICE_PATH:
device->device_path = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}